| visual impairment | | |
| n. (state) | 1. vision defect, visual defect, visual disorder, visual impairment | impairment of the sense of sight. |
| ~ amaurosis | partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain. |
| ~ amblyopia | visual impairment without apparent organic pathology. |
| ~ ametropia | (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia. |
| ~ aniseikonia | visual defect in which the shape and size of an ocular image differ in the two eyes. |
| ~ anorthopia | distorted vision in which straight lines appear curved. |
| ~ aphakia | absence of the natural lens of the eye (usually resulting from the removal of cataracts). |
| ~ blindness, cecity, sightlessness | the state of being blind or lacking sight. |
| ~ color blindness, color vision deficiency, colour blindness, colour vision deficiency | genetic inability to distinguish differences in hue. |
| ~ diplopia, double vision | visual impairment in which an object is seen as two objects.; "diplopia often disappears when one eye is covered" |
| ~ disability, disablement, handicap, impairment | the condition of being unable to perform as a consequence of physical or mental unfitness.; "reading disability"; "hearing impairment" |
| ~ day blindness, hemeralopia | inability to see clearly in bright light. |
| ~ hemianopia, hemianopsia | blindness in one half of the visual field of one or both eyes. |
| ~ quadrantanopia | blindness in one fourth of the visual field. |
| ~ metamorphopsia | a defect of vision in which objects appear to be distorted; usually due to a defect in the retina. |
| ~ moon blindness, night blindness, nyctalopia | inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder. |
| ~ photoretinitis | damage to the retina resulting from exposure of the eye to the sun without adequate protection. |
| ~ detached retina, detachment of the retina, retinal detachment | visual impairment resulting from the retina becoming separated from the choroid in the back of the eye; treated by photocoagulation. |
| ~ scotoma | an isolated area of diminished vision within the visual field. |
| ~ tunnel vision | visual impairment involving a loss of peripheral vision. |
| ~ xanthopsia | visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice. |
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